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Thermophysics and Aeromechanics

2021 year, number 3

Generation of composite particle material due to coagulation of several dispersed fractions in gas suspension flow

A.L. Tukmakov
Institute for Mechanics and Mechanical Engineering KSC RAS, Kazan, Russia
Keywords: two-fraction gas suspension, Navier-Stokes equations, Mac-Cormack explicit scheme, coagulation, composite materials

Abstract

The paper studies evolution of size distribution for a solid-and-droplet suspension gas flow with account for velocity slippage for the flow fractions. This process is described by the Eulerean model for polydisperse gas suspension: it consists of several fractions of metal solids and fractions of polymer droplets in air. The carrier medium (air) flow is described by a system of equations for motion of viscous compressible thermal-conductive gas with account for energy and momentum transfer to the suspended particle fractions. The dynamics of each of the dispersion fraction is described by gas dynamic equations with account for momentum and energy transfer from the suspension to the carrier flow. A set of equations for the gas suspension is formulated in general curvilinear coordinates and can be solved by the predictor-corrector explicit numerical method. The method comprises splitting of a space operator by directions and a nonlinear correction scheme for every time step. The coagulation of metal particle fractions and polymer fractions is described by Smolukhovsky’s model. This model considers the pair collisions of particles and calculates the physical parameters of each fractions (mass, radius, temperature, velocity and average density) for every time step of numerical simulation. The time and spatial parameters of metal and polymer particles coalescence in a gas flow are calculated with account for velocity slippage.